What are federal and state laws in the United States? Which one is from the country?

Federal law is the highest federal law in the United States, which stipulates the constitution of the country, the mechanism of checks and balances of power, and the basic rights of citizens. At the same time, it limits the areas and scope that federal laws and the federal government can legislate or govern (if state laws conflict with the jurisdiction authorized by these federal constitutions, state laws are state laws, which must be within the scope of the federal constitution and cannot conflict with federal laws). For areas where the federal constitution does not authorize federal laws and the federal government to have jurisdiction and legislative power, they are completely "reserved" to the state government, which has complete legislative power and management power over these areas and is not restricted by federal laws. That's why if you are in the United States, you will see driver's license, various professional qualifications (such as lawyer's license, notary's license, nurse's license, etc. ) Unlike birth certificates, the procedures for marriage, divorce and company registration vary from state to state.

Generally speaking, the federal constitution and other federal laws are applicable within the United States, while state laws are applicable within the state. In some fields, such as bankruptcy law, immigration law, intellectual property law, etc. , it basically belongs to the scope of federal law; Some fields, such as tort law, real estate law, marriage law, etc. , basically in full compliance with national laws; But there are still some fields, such as criminal law, contract law, labor law and so on. , usually subject to federal and state laws.